Different Website when adding www

So I am on a Dynamic IP address, so I use dyndns.org to host the website.

When I go to remcycle.net I get text that says "It Works"

When going to www.remcycle.net I get "Welcome to your website!This is the default index page of your website.
This file may be deleted or overwritten without any difficulty. This is produced by the file index.html in the web directory.

For questions or problems please contact support.

Powered by ISPConfig"

I have never seen the second one before... it has always just said "It Works"